The reason and solution of unstable coke oven gas measurement by vortex flowmeter

Abstract: The reasons and solutions for the instability of coke oven gas measured by vortex flowmeter meters are provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. Vortex flowmeter measures coke oven gas instability causes and solutions flowmeter. It breaks through. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the article details of the reasons and solutions for the instability of coke oven gas measured by vortex flowmeters. Vortex flowmeter measures coke oven gas instability causes and solutions flowmeter. It breaks through the limitation of traditional analog processing of vortex street signals, and uses modern digital signal processing methods to identify and screen vortex street probe signals, so as to obtain normal flow signals, which greatly improves the seismic performance of vortex street, fundamentally It solves the problem that the vortex street is not anti-seismic for decades. It is widely used in the flow of water, salt and wind in petrochemical, light industry, thermal power, papermaking and other industries. Vortex flowmeters are still widely used in the measurement of coke oven gas, but there are also some problems. Reasons and solutions: The reasons for the failure of the on-site metering system can be summarized into two major reasons, one is caused by the flow meter or its related equipment. The second is the non-flow meter reason, that is, the flow meter is normal, but the environment or system causes the failure, and such reasons are difficult to find. In addition to requiring technicians to be familiar with the performance of the instrument, it is also necessary to have extensive knowledge and rich field experience for analysis, reasoning, and multi-party tests to confirm. Some failures are also caused by unexpected events. For non-flow instrument failures, the output signal is often unstable. According to practical experience, when the vortex flowmeter measures coke oven gas, the reasons for the instability of the output signal are as follows: 1) It is widely known by users that the vortex flowmeter is not suitable for installation in strong vibration occasions, but in the magnetic field In the case of frequent changes, the vortex flow sensor will measure the signal output higher than the normal value. Practice has proved that in a field without gas flow, when the vortex flow sensor is in a changing magnetic field, at the moment when the magnetic field changes, the vortex flow sensor will sense an error signal and output, when the change is over, the instrument is in a stable magnetic field. , the meter will output a normal signal. 2) The coke oven gas has high temperature and high humidity when it leaves the factory, so there will be moisture in the gas transportation process. The gas flow drives the water to fluctuate back and forth, thus forming a pulsating flow. When the vortex flow sensor is in this fluid state, the output data fluctuates, which cannot reflect the production status at all. 3) Because coke oven gas has many impurities, it is easy to crystallize, and the impurities condense on the sensing head, resulting in measurement inaccuracy. When the temperature increases, the impurities volatilize, the sensitivity increases, and the signal increases; on the contrary, it decreases. This results in data instability. 4) The pressure line is not solid during the wiring process of the instrument, which causes the intermittent signal during the transmission process. 5) The ground wire of the instrument does not meet the requirements of the specification, so that the 50Hz interference in the strong current enters. When the normal signal is higher than 50Hz, the normal signal is output, otherwise, the error signal is output. Solution: 1) In the process of instrument installation and connection, it is necessary to ensure that every link is accurate, including site inspection before installation, instrument wiring during installation, system grounding, etc., so as to ensure that real data is detected and can output accurately. 2) For the metering system in operation, it can be used“Double-track metering, comparison and confirmation”method, and“Alternative method”Confirm and eliminate the faults of the measuring instruments in operation. 3) Regularly clean the instrument as a whole, and if necessary, purge the sensor head part of the instrument to avoid condensation of impurities at the sensor head. In cold seasons, adding heat tracing devices in the straight pipe section of the metering and the instrument part is also beneficial to relieve the condensation of impurities at the metering instrument. 4) Drain the pipeline regularly, especially the water before the straight pipe section. According to the specific situation, set up a special person to discharge it regularly, reduce the water in the metering pipe section as much as possible, and eliminate the pulsation in the fluid to the maximum extent. 5) Strengthen the management of the data of the metering system, set the timing printing function, and analyze the operation of the instrument according to the printing data combined with the production status. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Causes and solutions for unstable coke oven gas measurement by vortex flowmeter'

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